Blue Buffalo Healthy Aging Mature cat food is holistically formulated to support the needs of cats in their mature years. Cats love the tasty chicken, and it provides them with essential amino acids they need every day. Hearty whole grains like brown rice, barley and oats supply the complex carbohydrates that your cat needs for energy. Whole carrots, sweet potatoes and parsley are three of the nutrient-rich vegetables that your cat will get in every bite of Blue Buffalo.